Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Polyembryony
Presence of more than one embryo in a seed is termed polyembryony. The phenomenon, first discovered in orange seeds by Leeuwenhoek (1719), attracted considerable attention because of its potential for application in and horticulture. Polyembryony is broadly classified into simple and multiple, depending on whether the supernumerary arises in one or more embryo sacs in the ovule. Simple polyembryony may be sexual or asexual. In sexual polyembryony embryos may originate from the fertilized egg and synergids, or by budding or cleavage of the polyembryony cells or suspensor of the zygotic embryo.
Asexual embryos are produced within the embryo sac without fertilization. Embryos may also originate from diploid nucellar or integumentary cells of the ode and grow into the embryo sac. These embryos are termed adventive or sporophytic. Multiple polyembryonies involve production of accessory embryos from two or more embryo sacs in the same ovule. For example, in the sea Island cotton, Gossypium barbadense, fertilization of egg in one embryo sac stimulates the induction of embryo from an unfertilized egg in the adjacent embryo sac within the same ovule. Thus, diploid-haploid twin embryos are produced in the seed.
How does phosphocreatine act in the muscle contraction and relaxation? Phosphocreatine is the main means of energy storage of the muscle cells. During relaxed periods ATP mo
what are the scopes of zoology
Describe the IMPACT AND BURDEN OF HEART DISEASES ? No discussion on the epidemiology of heart diseases will be complete without a look at the tremendous burden put by different
Q. Symptoms of Angina Pectoris? The pain of angina is usually over the center of the chest (below the sternum) but can be felt from epigastrum to the jaw and arms. It is brough
Red-green colour blindness is X-linked recessive. A woman with normal colour vision has a father who is red-green colour-blind. The woman has four sons, none of whom are colour-bli
Informatics is the study of the application of computer and statistical techniques to the management of information. In the genome projects, informatics includes the development o
In the previous section we discussed the concept of species in detail and concluded that the concept of biological species and Mayr's definition of species have a wide acceptance a
Describe Surgical Treatment prosthetic valve endocarditis ? If there is definite indication for early surgery, the current understanding is to proceed with valve replacement ir
Nursing Management Propped up position. Monitor signs and symptoms and laboratory test results documenting myocarditis. Monitor adequacy of cardiac output and hemo
Nemerteans - Regeneration in Invertebrates Nemerteans as well possess remarkable regenerative ability, as even a small fragment can regenerate into a complete worm. Nemerteans
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd